CVEvulnerability

CVE-2026-39378

6.5 MEDIUM Published 2026-04-21 Modified 2026-10-26 Official page ↗
Status
Analyzed
Published
2026-04-21
Last modified
2026-10-26
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Weaknesses
CWE-22, CWE-73

Description

The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. In versions 6.5 through 7.17.0, when `HTMLExporter.embed_images=True`, nbconvert's markdown renderer allows arbitrary file read via path traversal in image references. A malicious notebook can exfiltrate sensitive files from the conversion host by embedding them as base64 data URIs in the output HTML. nbconvert 7.17.1 contains a fix. As a workaround, do not enable `HTMLExporter.embed_images`; it is not enabled by default.

Affected configurations

• jupyter nbconvert (>= 6.5.0 < 7.17.1)

Related

Weakness · CWE (2)

  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory weakness
  • CWE-73 External Control of File Name or Path weakness

References